Template initialization for evoked response detection

a technology of evoked response and template, applied in electrotherapy, therapy, etc., can solve the problems of ineffective pacing, discomfort, and reduced pumping efficiency

Inactive Publication Date: 2011-04-19
CARDIAC PACEMAKERS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach enhances the accuracy of capture detection, reduces energy wastage, and ensures consistent pacing by differentiating between captured and non-captured responses, thus optimizing energy management and patient comfort.

Problems solved by technology

However, due to disease or injury, the heart rhythm may become irregular resulting in diminished pumping efficiency.
If the pace pulse energy is too low, the pace pulses may not reliably produce a contractile response in the heart and may result in ineffective pacing.
If the pace pulse energy is too high, the patient may experience discomfort and the battery life of the device will be shorter.
In pseudofusion, the pacing stimulus may be ineffective because the tissue around the electrode has already spontaneously depolarized and is in its refractory period.
During normal pacing, the presence of fusion or pseudofusion beats may be of little consequence except for wasted energy due to the generation of unnecessary pace pulses.
Fusion or pseudofusion beats may cause false detection of capture and may lead to erroneous capture threshold values.

Method used

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  • Template initialization for evoked response detection
  • Template initialization for evoked response detection
  • Template initialization for evoked response detection

Examples

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Embodiment Construction

[0024]In the following description of the illustrated embodiments, references are made to the accompanying drawings forming a part hereof, and in which are shown, by way of illustration, various embodiments by which the invention may be practiced. It is to be understood that other embodiments may be utilized, and structural and functional changes may be made without departing from the scope of the present invention.

[0025]Cardiac rhythm management (CRM) devices such as pacemakers operate to stimulate the heart tissue via implanted electrodes to produce a contraction of the tissue. A series of low energy pace pulses may be delivered to the heart, the pacing pulses timed to assist the heart in producing a contractile rhythm that maintains cardiac pumping efficiency. Pacing may be intermittent or continuous, depending on the needs of the patient. There exist a number of categories of pacemaker devices, with various modes for sensing and pacing one or more heart chambers.

[0026]After deli...

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Abstract

Methods and devices for initializing templates for evoked response detection from pacing stimulation are described. A method of generating templates characterizing a cardiac response to pacing involves determining values associated with signal features for each of a number of sensed cardiac signals following pacing pulses. The median values of the features are used to generate a cardiac response template.

Description

RELATED PATENT DOCUMENT[0001]This patent application is related to commonly owned U.S. Pat. No. 7,330,761, and incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates generally to implantable medical devices and, more particularly, to initializing and adapting baselines and / or templates for evoked response detection following delivery of a pace pulse.BACKGROUND OF THE INVENTION[0003]When functioning normally, the heart produces rhythmic contractions and is capable of efficiently pumping blood throughout the body. However, due to disease or injury, the heart rhythm may become irregular resulting in diminished pumping efficiency.[0004]Arrhythmia is a general term used to describe heart rhythm irregularities arising from a variety of physical conditions and disease processes. Cardiac rhythm management systems, such as implantable pacemakers and cardiac defibrillators, have been used as an effective treatment for patients with serious arrhythmias. Thes...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): A61N1/37
CPCA61N1/3712
InventorZHANG, GENG
OwnerCARDIAC PACEMAKERS INC